First cut the playoffs in half. 16 teams is more then half the league, do they really need that many teams in the playoffs considering that more then half of them suck. It takes them 2 months just to get through it all plus the TV schedule is horrible. I don't care for the NBA but sometimes I will watch the playoffs. I don't think i even watched more then 5 minutes the whole time. And the games I did watch I was not even paying attention.
Second, the players have gotten to flashy and have forgotten about the game play.
I would:
1) allow challenges like in football. If your challenge fails, you give up a timeout.
2) blatant flopping should be a technical foul.
3) first round of playoffs should go back to 5/or cut the regular season down to 50-65 games.